The top U.S. envoy to Iraq said Monday that the 2003 toppling of Saddam Hussein’s regime had opened a “Pandora’s box” of volatile ethnic and sectarian tensions that could engulf the region in all-out war if America pulled out of the country too soon. In remarks that were among the frankest and bleakest public assessments of the Iraq situation by a high-level American official, U.S. Ambassador Zalmay Khalilzad said the “potential is there” for sectarian violence to become full-blown civil war. Full Story